#! ruby
# yukicoder My Practice
# author: Leonardone @ NEETSDKASU

N = gets.to_i
C = gets.split.map(&:to_i)

allvote = C.inject(:+).to_f

money = 0

C.each do |x|
	if (x.to_f / allvote) <= 0.1
		money += 30
	end
end

puts money